For the fiscal year endedDecember 31, 2025 OR TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _______to_______ Commission file number001-00566 A.Full title of the plan and the address of the plan, if different from that of the issuer named below: Greif 401(k) Retirement Plan B.Name of issuer of the securities held pursuant to the plan and the address of its principal executive office: Greif, Inc.425 Winter RoadDelaware, Ohio 43015 REQUIRED INFORMATION The following financial statements for the Greif 401(k) Retirement Plan are being filed herewith: Page No. DescriptionFinancial Statements: As of December 31, 2025 and 2024 and for the year ended December 31, 2025Report of Independent Registered Public Accounting FirmStatements of Net Assets Available for BenefitsStatement of Changes in Net Assets Available for BenefitsNotes to Financial StatementsSupplemental Schedule:Schedule H, Part IV, Line 4i - Schedule of Assets (Held at End of Year)Signatures Note: All other schedules required by Section 2520.103-10 of the Department of Labor's Rules and Regulations for Reporting andDisclosure under the Employee Retirement Income Security Act of 1974 have been omitted because they are not applicable. The following exhibits are being filed herewith: DescriptionConsent of Independent Registered Public Accounting Firm Exhibit No.23.1 To the Audit Committee,North American Retirement Plans Committee,Plan Administrator and Participants ofGreif 401(k) Retirement PlanDelaware, Ohio Report of Independent Registered Public Accounting Firm Opinion on the Financial Statements We have audited the accompanying statements of net assets available for benefits of the Greif 401(k) Retirement Plan (the “Plan”) asof December 31, 2025 and 2024, the related statement of changes in net assets available for benefits for the year ended December 31,2025, and the related notes and schedule (collectively, the “financial statements”). In our opinion, the financial statements presentfairly, in all material respects, the net assets available for benefits of the Plan as of December 31, 2025 and 2024, and the changes innet assets available for benefits for the year ended December 31, 2025, in conformity with accounting principles generally accepted inthe United States of America. Basis for Opinion These financial statements are the responsibility of the Plan's management. Our responsibility is to express an opinion on the Plan’sfinancial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting OversightBoard (United States) (“PCAOB”) and are required to be independent with respect to the Plan in accordance with the U.S. federalsecurities laws and the applicable rules and regulations of the Securities Exchange Commission and the PCAOB. We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the auditto obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud.The Plan is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part ofour audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressingan opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion. Our audits included performing procedures to assess the risk of material misstatement of the financial statements, whether due to erroror fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidenceregarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles usedand significant estimates made by the Plan’s management, as well as evaluating the overall presentation of the financial statements. Webelieve that our audits provide a reasonable basis for our opinion. Supplemental Information The supplemental information in the accompanying schedule of assets (held at end of year) as of December 31, 2025 has beensubjected to audit procedures performed in conjunction with the audit of the Plan's financial statements. The supplemental informationis presented for the purpose of additional analysis and is not a required part of the financial statements but included supplementalinformation required by the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the EmployeeRetirement Income Security Act of 1974. The supplemental information is the responsibility of the Plan's management. Our auditprocedures included determining whether the supplemental information reconciles to the financial statements or the underlyingaccounting and other records, as applicable, and performing procedu